SD1K: A Dataset of Challenging Mathematical Problems for Reasoning Large Language Models

The dataset contains 1,000 entries organized in a structured JSON format. Each entry consists of two fields: instruction and output. The instruction field presents a high-difficulty mathematical problem in natural language, while the output field contains the complete reasoning process generated by a large reasoning model. Specifically, the output includes a think field, which provides a detailed long-chain reasoning solution, and an answer field, which summarizes the final standard answer.